Don't be discouraged. Everyone has different taste in colors, but everyone should have the same manners! My lesson like that is I offered to make a quilt for a non sewing friend. I HATED her fabric selection in some of the colors, but I kept my mouth shut. It was her quilt.
When I was finished, the colors I had hated the most were the ones that made the quilt. A lesson learned.
Not knowing the pattern, adding sashing to even the blocks out is an option. The other is to trim the blocks to the smallest sized one and adjust the rest of the block, if that isn't too complicated.